public class Demo2 {
    public static void main(String[] args) {
        Object locker1 = new Object();
        Object locker2 = new Object();
        Thread t1 = new Thread(() -> {
            synchronized (locker1) {
                System.out.println("t1 locker1");
                synchronized (locker2) {
                    System.out.println("t1 locker2");
                }
            }
        });
        Thread t2 = new Thread(() -> {
            synchronized (locker1) {
                System.out.println("t2 locker1");
                synchronized (locker2) {
                    System.out.println("t2 locker2");
                }
            }
        });
        t1.start();
        t2.start();
    }
}
